<?php
class zip
{
	var $datasec, $ctrl_dir = array();
	var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
	var $old_offset = 0; var $dirs = Array(".");

	function get_List($zip_name)
	{
		$ret = '';
		$zip = @fopen($zip_name, 'rb');
		if(!$zip)
		{
			return(0);
		}
		$centd = $this->ReadCentralDir($zip,$zip_name);
		@rewind($zip);
		@fseek($zip, $centd['offset']);
		for ($i=0; $i<$centd['entries']; $i++)
		{
			$header = $this->ReadCentralFileHeaders($zip);
			$header['index'] = $i;$info['filename'] = $header['filename'];
			$info['stored_filename'] = $header['stored_filename'];
			$info['size'] = $header['size'];$info['compressed_size']=$header['compressed_size'];
			$info['crc'] = strtoupper(dechex( $header['crc'] ));
			$info['mtime'] = $header['mtime']; $info['comment'] = $header['comment'];
			$info['folder'] = ($header['external']==0x41FF0010||$header['external']==16)?1:0;
			$info['index'] = $header['index'];$info['status'] = $header['status'];
			$ret[]=$info; unset($header);
		}
		return $ret;
	}

	function Add($files,$compact)
	{
		if(!is_array($files[0]))
		{
			$files=Array($files);
		}
		for($i=0;$files[$i];$i++)
		{
			$fn = $files[$i];
			if(!in_Array(dirname($fn[0]),$this->dirs))
			{
				$this->add_Dir(dirname($fn[0]));
			}
			if(basename($fn[0]))
			{
				$ret[basename($fn[0])]=$this->add_File($fn[1],$fn[0],$compact);
			}
		}
		return $ret;
	}

	function get_file()
	{
		$data = implode('', $this -> datasec);
		$ctrldir = implode('', $this -> ctrl_dir);
		return $data . $ctrldir . $this -> eof_ctrl_dir .
		pack('v', sizeof($this -> ctrl_dir)).pack('v', sizeof($this -> ctrl_dir)).
		pack('V', strlen($ctrldir)) . pack('V', strlen($data)) . "\x00\x00";
	}

	function add_dir($name)
	{
		$name = str_replace("\\", "/", $name);
		$fr = "\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00";
		$fr .= pack("V",0).pack("V",0).pack("V",0).pack("v", strlen($name) );
		$fr .= pack("v", 0 ).$name.pack("V", 0).pack("V", 0).pack("V", 0);
		$this -> datasec[] = $fr;
		$new_offset = strlen(implode("", $this->datasec));
		$cdrec = "\x50\x4b\x01\x02\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00";
		$cdrec .= pack("V",0).pack("V",0).pack("V",0).pack("v", strlen($name) );
		$cdrec .= pack("v", 0 ).pack("v", 0 ).pack("v", 0 ).pack("v", 0 );
		$ext = "\xff\xff\xff\xff";
		$cdrec .= pack("V", 16 ).pack("V", $this -> old_offset ).$name;
		$this -> ctrl_dir[] = $cdrec;
		$this -> old_offset = $new_offset;
		$this -> dirs[] = $name;
	}

	//编译指定的文件为zip文件（filename可以为文件数组array、目录dir或单个文件file）
	//it柏拉图增加的方法
	function CompileZipFile($filename, $tozipfilename,$ftype='dir')
	{
		if (@function_exists('gzcompress'))
		{
			if($ftype=='dir')
			{
				$filelist =  $this->ListDirFiles($filename);
			}
			else if($ftype=='file')
			{
				$filelist[] =  $filename;
			}
			else
			{
				$filelist =  $filename;
			}
			$i = 0;
			if(count($filelist)>0)
			{
				foreach($filelist as $filename)
				{
					if (is_file($filename))
					{
						$i++;
						$fd = fopen ($filename, "r");
						if(filesize($filename)>0)
						{
							$content = fread($fd, filesize($filename));
						}
						else
						{
							$content = ' ';
						}
						fclose ($fd);

						//if (is_array($dir)) $filename = basename($filename);
						$this->add_File($content, $filename);
					}
				}
				$out = $this->get_file();
				$fp = fopen($tozipfilename, "w");
				fwrite($fp, $out, strlen($out));
				fclose($fp);
			}
			return $i;
		}
		else
		{
			return 0;
		}
	}

	//读取某文件夹的所有文件
	function ListDirFiles($dirname)
	{
		$files = array();
		if(is_dir($dirname))
		{
			$fh = opendir($dirname);
			while (($file = readdir($fh)) !== false)
			{
				if (strcmp($file, '.')==0 || strcmp($file, '..')==0)
				{
					continue;
				}
				$filepath = $dirname . '/' . $file;
				if ( is_dir($filepath) )
				{
					$files = array_merge($files, $this->ListDirFiles($filepath));
				}
				else
				{
					array_push($files, $filepath);
				}
			}
			closedir($fh);
		}
		else
		{
			$files = false;
		}
		return $files;
	}

	function add_File($data, $name, $compact = 1)
	{
		$name     = str_replace('\\', '/', $name);
		$dtime    = dechex($this->DosTime());

		$hexdtime = '\x' . $dtime[6] . $dtime[7].'\x'.$dtime[4] . $dtime[5]
		. '\x' . $dtime[2] . $dtime[3].'\x'.$dtime[0].$dtime[1];
		eval('$hexdtime = "' . $hexdtime . '";');
		if($compact)
		$fr = "\x50\x4b\x03\x04\x14\x00\x00\x00\x08\x00".$hexdtime;
		else
		{
			$fr = "\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00".$hexdtime;
		}
		$unc_len = strlen($data); $crc = crc32($data);
		if($compact)
		{
			$zdata = gzcompress($data); $c_len = strlen($zdata);
			$zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2);
		}
		else
		{
			$zdata = $data;
		}
		$c_len=strlen($zdata);
		$fr .= pack('V', $crc).pack('V', $c_len).pack('V', $unc_len);
		$fr .= pack('v', strlen($name)).pack('v', 0).$name.$zdata;
		$fr .= pack('V', $crc).pack('V', $c_len).pack('V', $unc_len);
		$this -> datasec[] = $fr;
		$new_offset        = strlen(implode('', $this->datasec));
		if($compact)
		{
			$cdrec = "\x50\x4b\x01\x02\x00\x00\x14\x00\x00\x00\x08\x00";
		}
		else
		{
			$cdrec = "\x50\x4b\x01\x02\x14\x00\x0a\x00\x00\x00\x00\x00";
		}
		$cdrec .= $hexdtime.pack('V', $crc).pack('V', $c_len).pack('V', $unc_len);
		$cdrec .= pack('v', strlen($name) ).pack('v', 0 ).pack('v', 0 );
		$cdrec .= pack('v', 0 ).pack('v', 0 ).pack('V', 32 );
		$cdrec .= pack('V', $this -> old_offset );
		$this -> old_offset = $new_offset;
		$cdrec .= $name;
		$this -> ctrl_dir[] = $cdrec;
		return true;
	}

	function DosTime()
	{
		$timearray = getdate();
		if ($timearray['year'] < 1980)
		{
			$timearray['year'] = 1980; $timearray['mon'] = 1;
			$timearray['mday'] = 1; $timearray['hours'] = 0;
			$timearray['minutes'] = 0; $timearray['seconds'] = 0;
		}
		return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) |     ($timearray['mday'] << 16) | ($timearray['hours'] << 11) |
		($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
	}

	//解压整个压缩包
	//直接用 Extract 会有路径问题，本函数先从列表中获得文件信息并创建好所有目录然后才运行 Extract
	function ExtractAll ( $zn, $to)
	{
		if(substr($to,-1)!="/")
		{
			$to .= "/";
		}
		$files = $this->get_List($zn);
		$cn = count($files);
		if(is_array($files))
		{
			for($i=0;$i<$cn;$i++)
			{
				if($files[$i]['folder']==1)
				{
					@mkdir($to.$files[$i]['filename'],$GLOBALS['cfg_dir_purview']);
					@chmod($to.$files[$i]['filename'],$GLOBALS['cfg_dir_purview']);
				}
			}
		}
		$this->Extract ($zn,$to);
	}

	function Extract ( $zn, $to, $index = Array(-1) )
	{
		$ok = 0; $zip = @fopen($zn,'rb');
		if(!$zip)
		{
			return(-1);
		}
		$cdir = $this->ReadCentralDir($zip,$zn);
		$pos_entry = $cdir['offset'];
		if(!is_array($index))
		{
			$index = array($index);
		}
		for($i=0; isset($index[$i]);$i++)
		{
			if(intval($index[$i])!=$index[$i]||$index[$i]>$cdir['entries'])
			{
				return(-1);
			}
		}
		for ($i=0; $i<$cdir['entries']; $i++)
		{
			@fseek($zip, $pos_entry);
			$header = $this->ReadCentralFileHeaders($zip);
			$header['index'] = $i; $pos_entry = ftell($zip);
			@rewind($zip); fseek($zip, $header['offset']);
			if(in_array("-1",$index)||in_array($i,$index))
			{
				$stat[$header['filename']]=$this->ExtractFile($header, $to, $zip);
			}

		}
		fclose($zip);
		return $stat;
	}

	function ReadFileHeader($zip)
	{
		$binary_data = fread($zip, 30);
		$data = unpack('vchk/vid/vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len', $binary_data);
		$header['filename'] = fread($zip, $data['filename_len']);
		if ($data['extra_len'] != 0)
		{
			$header['extra'] = fread($zip, $data['extra_len']);
		}
		else
		{
			$header['extra'] = '';
		}
		$header['compression'] = $data['compression'];$header['size'] = $data['size'];
		$header['compressed_size'] = $data['compressed_size'];
		$header['crc'] = $data['crc']; $header['flag'] = $data['flag'];
		$header['mdate'] = $data['mdate'];$header['mtime'] = $data['mtime'];
		if ($header['mdate'] && $header['mtime'])
		{
			$hour=($header['mtime']&0xF800)>>11;$minute=($header['mtime']&0x07E0)>>5;
			$seconde=($header['mtime']&0x001F)*2;$year=(($header['mdate']&0xFE00)>>9)+1980;
			$month=($header['mdate']&0x01E0)>>5;$day=$header['mdate']&0x001F;
			$header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
		}
		else
		{
			$header['mtime'] = time();
		}
		$header['stored_filename'] = $header['filename'];
		$header['status'] = "ok";
		return $header;
	}

	function ReadCentralFileHeaders($zip)
	{
		$binary_data = fread($zip, 46);
		$header = unpack('vchkid/vid/vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $binary_data);
		if ($header['filename_len'] != 0)
		{
			$header['filename'] = fread($zip,$header['filename_len']);
		}
		else
		{
			$header['filename'] = '';
		}
		if ($header['extra_len'] != 0)
		{
			$header['extra'] = fread($zip, $header['extra_len']);
		}
		else
		{
			$header['extra'] = '';
		}
		if ($header['comment_len'] != 0)
		{
			$header['comment'] = fread($zip, $header['comment_len']);
		}
		else
		{
			$header['comment'] = '';
		}
		if ($header['mdate'] && $header['mtime'])
		{
			$hour = ($header['mtime'] & 0xF800) >> 11;
			$minute = ($header['mtime'] & 0x07E0) >> 5;
			$seconde = ($header['mtime'] & 0x001F)*2;
			$year = (($header['mdate'] & 0xFE00) >> 9) + 1980;
			$month = ($header['mdate'] & 0x01E0) >> 5;
			$day = $header['mdate'] & 0x001F;
			$header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
		}
		else
		{
			$header['mtime'] = time();
		}
		$header['stored_filename'] = $header['filename'];
		$header['status'] = 'ok';
		if (substr($header['filename'], -1) == '/')
		{
			$header['external'] = 0x41FF0010;
		}
		return $header;
	}

	function ReadCentralDir($zip,$zip_name)
	{
		$size = filesize($zip_name);
		if ($size < 277)
		{
			$maximum_size = $size;
		}
		else
		{
			$maximum_size=277;
		}
		@fseek($zip, $size-$maximum_size);
		$pos = ftell($zip); $bytes = 0x00000000;

		while ($pos < $size)
		{
			$byte = @fread($zip, 1); $bytes=($bytes << 8) | Ord($byte);
			if ($bytes == 0x504b0506)
			{
				$pos++; break;
			}
			$pos++;
		}
		$data = @unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size',fread($zip, 18));
		if ($data['comment_size'] != 0)
		{
			$centd['comment'] = fread($zip, $data['comment_size']);
		}
		else
		{
			$centd['comment'] = ''; $centd['entries'] = $data['entries'];
		}
		$centd['disk_entries'] = $data['disk_entries'];
		$centd['offset'] = $data['offset'];$centd['disk_start'] = $data['disk_start'];
		$centd['size'] = $data['size'];  $centd['disk'] = $data['disk'];
		return $centd;
	}

	function ExtractFile($header,$to,$zip)
	{
		$header = $this->readfileheader($zip);
		$header['external'] = (!isset($header['external']) ? 0 : $header['external']);
		if(substr($to,-1)!="/")
		{
			$to.="/";
		}
		if(!@is_dir($to))
		{
			@mkdir($to,$GLOBALS['cfg_dir_purview']);
		}
		if (!($header['external']==0x41FF0010)&&!($header['external']==16))
		{
			if ($header['compression']==0)
			{
				$fp = @fopen($to.$header['filename'], 'wb');
				if(!$fp)
				{
					return(-1);
				}
				$size = $header['compressed_size'];
				while ($size != 0)
				{
					$read_size = ($size < 2048 ? $size : 2048);
					$buffer = fread($zip, $read_size);
					$binary_data = pack('a'.$read_size, $buffer);
					@fwrite($fp, $binary_data, $read_size);
					$size -= $read_size;
				}
				fclose($fp);
				touch($to.$header['filename'], $header['mtime']);
			}
			else
			{
				$fp = @fopen($to.$header['filename'].'.gz','wb');
				if(!$fp)
				{
					return(-1);
				}
				$binary_data = pack('va1a1Va1a1', 0x8b1f, Chr($header['compression']),
				Chr(0x00), time(), Chr(0x00), Chr(3));
				fwrite($fp, $binary_data, 10);
				$size = $header['compressed_size'];
				while ($size != 0)
				{
					$read_size = ($size < 1024 ? $size : 1024);
					$buffer = fread($zip, $read_size);
					$binary_data = pack('a'.$read_size, $buffer);
					@fwrite($fp, $binary_data, $read_size);
					$size -= $read_size;
				}

				$binary_data = pack('VV', $header['crc'], $header['size']);
				fwrite($fp, $binary_data,8); fclose($fp);
				$gzp = @gzopen($to.$header['filename'].'.gz','rb') or die("Cette archive est compress");
				if(!$gzp)
				{
					return(-2);
				}
				$fp = @fopen($to.$header['filename'],'wb');
				if(!$fp)
				{
					return(-1);
				}
				$size = $header['size'];
				while ($size != 0)
				{
					$read_size = ($size < 2048 ? $size : 2048);
					$buffer = gzread($gzp, $read_size);
					$binary_data = pack('a'.$read_size, $buffer);
					@fwrite($fp, $binary_data, $read_size);
					$size -= $read_size;
				}
				fclose($fp); gzclose($gzp);
				touch($to.$header['filename'], $header['mtime']);
				@unlink($to.$header['filename'].'.gz');
			}
		}
		return true;
	}
}
?>